CN115529041A

CN115529041A - Sectional optional signal conditioning circuit and measuring device

Info

Publication number: CN115529041A
Application number: CN202211251346.XA
Authority: CN
Inventors: 胡俊
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-10-13
Filing date: 2022-10-13
Publication date: 2022-12-27

Abstract

The circuit outputs corresponding voltage threshold signals through each voltage threshold sub-circuit, and each voltage threshold signal is preset with threshold values with different sizes; each segmented voltage conditioning sub-circuit conditions the input voltage signal according to the corresponding conducting signal to obtain an output voltage signal; the selection circuit receives the input voltage signal and each voltage threshold signal, compares the voltage value of the input voltage signal with the threshold value of each voltage threshold signal, and outputs a corresponding conduction signal according to the comparison result, thereby realizing multi-section optional voltage signal conditioning. This application is through taking care of the voltage signal and carrying out optimal design, takes care of to the automatic segmentation of voltage, and flexibility adaptation multistage voltage is taken care of, increases the applicable sampling range that the voltage sampling was taken care of, improves sampling precision and commonality to widen the applicable scene that the voltage sampling was taken care of, improve the commonality of circuit and the accuracy that the sampling was taken care of.

Description

Sectional optional signal conditioning circuit and measuring device

Technical Field

The present application relates to the field of signal conditioning technologies, and in particular, to a segment-type selectable signal conditioning circuit and a measuring device.

Background

Signal conditioning circuitry is circuitry that converts analog signals into digital signals that can be used for data acquisition, controlling processes, performing calculations, display readings, and the like. Sampling and conditioning of voltage signals are the main components in the signal conditioning circuit.

In the actual voltage sampling process, the input voltage range is very wide. When the input voltage is larger, the range of the sampling circuit is exceeded; when the input voltage is too small, the sampling precision is insufficient or the sampling is not available. The same amplification factor is usually adopted to amplify and sample the input voltage, and the sampling precision is low and the sampling universality is high. If the microcontroller is adopted to control the segmented sampling, the circuit is complex and the cost is high.

Disclosure of Invention

Therefore, it is necessary to provide a segment-type optional signal conditioning circuit and a measuring device, which can increase the applicable sampling range of voltage sampling conditioning, improve the sampling precision and the universality, and widen the applicable scenes of the voltage sampling circuit, in order to solve the problems existing in the existing voltage sampling conditioning method.

In a first aspect, the present application provides a segmented, optionally configurable signal conditioning circuit, comprising:

a segmented voltage threshold circuit comprising at least two voltage threshold sub-circuits; each voltage threshold sub-circuit is configured to output a corresponding voltage threshold signal, and each voltage threshold signal is preset with a threshold value with different sizes;

the segmented voltage conditioning circuit comprises a plurality of segmented voltage conditioning sub-circuits; each segmented voltage conditioning sub-circuit is configured to condition an input voltage signal according to a corresponding conducting signal to obtain an output voltage signal;

the selection circuit is respectively connected with the segmented voltage threshold circuit and the segmented voltage conditioning circuit; the selection circuit is configured to receive the input voltage signal and each voltage threshold signal, compare the voltage value of the input voltage signal with the threshold value of each voltage threshold signal, and output a corresponding conducting signal according to the comparison result.

Optionally, the segmented voltage threshold circuit at least includes a first segmented voltage threshold sub-circuit and a second segmented voltage threshold sub-circuit; the first segmented voltage threshold sub-circuit is configured to output a first voltage threshold signal; the second segmented voltage threshold sub-circuit is configured to output a second voltage threshold signal; the threshold value of the first voltage threshold signal is smaller than the threshold value of the second voltage threshold signal;

the segmented voltage conditioning circuit at least comprises a first segmented voltage conditioning sub-circuit, a second segmented voltage conditioning sub-circuit and a third segmented voltage conditioning sub-circuit; the first segmented voltage conditioning sub-circuit is configured to condition an input voltage signal according to a received first conducting signal and output a first output voltage signal; the second segmented voltage conditioning sub-circuit is configured to condition the input voltage signal according to the received second conducting signal and output a second output voltage signal; the third segmented voltage conditioning sub-circuit is configured to condition the input voltage signal according to the received third conducting signal and output a third output voltage signal;

the selection circuit is configured to receive an input voltage signal, a first voltage threshold signal, and a second voltage threshold signal; the selection circuit is further configured to output a first conduction signal when the voltage value of the input voltage signal is less than the threshold value of the first voltage threshold signal, output a second conduction signal when the voltage value of the input voltage signal is greater than the threshold value of the first voltage threshold signal and less than the threshold value of the second voltage threshold signal, and output a third conduction signal when the voltage value of the input voltage signal is greater than the threshold value of the second voltage threshold signal.

Optionally, the selection circuit includes a first comparator, a second comparator, a third comparator, a fourth comparator, a first switch tube and a second switch tube;

the first input end of the first comparator is used for receiving an input voltage signal, the second input end of the first comparator is connected with the output end of the first segmented voltage threshold sub-circuit, and the output end of the first comparator is connected with the first segmented voltage conditioning sub-circuit; the power supply end of the first segmented voltage threshold sub-circuit is used for connecting a direct-current power supply;

the first input end of the second comparator is connected with the output end of the first subsection voltage threshold sub-circuit, the second input end of the second comparator is used for receiving an input voltage signal, and the output end of the second comparator is connected with the grid electrode of the first switch tube and the grid electrode of the second switch tube respectively;

the first input end of the third comparator is connected with the output end of the second subsection voltage threshold sub-circuit, the second input end of the third comparator is connected with the source electrode of the first switching tube, and the output end of the third comparator is connected with the third subsection voltage conditioning sub-circuit;

a first input end of the fourth comparator is connected with the source electrode of the first switching tube, a second input end of the fourth comparator is connected with the output end of the second segmented voltage threshold sub-circuit, and the output end of the fourth comparator is connected with the second segmented voltage conditioning sub-circuit;

the drain electrode of the first switching tube is used for accessing an input voltage signal; the drain electrode of the second switch tube is connected with the direct-current power supply, and the source electrode of the second switch tube is connected with the power supply end of the second segmented voltage threshold sub-circuit.

Optionally, the first segment voltage threshold sub-circuit includes a first resistor and a second resistor;

the first end of the first resistor is connected with the direct-current power supply, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is connected with the ground wire, and the second input end of the first comparator and the first input end of the second comparator are respectively connected between the second end of the first resistor and the first end of the second resistor.

Optionally, the second segment voltage threshold sub-circuit includes a third resistor and a fourth resistor;

the first end of the third resistor is connected with the source electrode of the second switch tube, the second end of the third resistor is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the ground wire, and the first input end of the third comparator and the second input end of the fourth comparator are respectively connected between the second end of the third resistor and the first end of the fourth resistor.

Optionally, the first segmented voltage conditioning sub-circuit includes a third switching tube and a first proportional operational amplifier sub-circuit;

the grid electrode of the third switching tube is connected with the output end of the first comparator, and the drain electrode of the third switching tube is used for accessing an input voltage signal; the source electrode of the third switching tube is connected with the non-inverting input end of the first proportional operational amplification sub-circuit, and the output end of the first proportional operational amplification sub-circuit is configured to output a first proportional amplification voltage signal.

Optionally, the second segmented voltage conditioning sub-circuit includes a fourth switching tube, a second proportional operational amplifier sub-circuit, a first differential amplifier sub-circuit, and a first continuous output regulating circuit;

the grid electrode of the fourth switching tube is connected with the output end of the fourth comparator, and the drain electrode of the fourth switching tube is used for accessing an input voltage signal; the source electrode of the fourth switching tube is connected with the non-inverting input end of the second proportional operational amplification sub-circuit, the output end of the second proportional operational amplification sub-circuit is configured to transmit a second proportional amplification voltage signal to the non-inverting input end of the first differential amplification sub-circuit, and the inverting input end of the first differential amplification sub-circuit is connected with the first continuous output regulating circuit; the output of the first differential amplification sub-circuit is configured to output a regulated second scaled amplified voltage signal.

Optionally, the third segmented voltage conditioning sub-circuit includes a fifth switching tube, a third proportional operational amplifier sub-circuit, a second differential amplifier sub-circuit, and a second continuous output adjusting circuit;

the grid electrode of the fifth switching tube is connected with the output end of the third comparator, and the drain electrode of the fifth switching tube is used for accessing an input voltage signal; the source electrode of the fifth switching tube is connected with the non-inverting input end of the third proportional operational amplification sub-circuit, the output end of the third proportional operational amplification sub-circuit is configured to transmit a third proportional amplification voltage signal to the non-inverting input end of the second differential amplification sub-circuit, and the inverting input end of the second differential amplification sub-circuit is connected with the second continuous output regulating circuit; the output of the second differential amplification sub-circuit is configured to output the regulated third scaled amplified voltage signal.

Optionally, the first segment voltage conditioning sub-circuit further includes a first voltage follower sub-circuit; the second segmented voltage conditioning sub-circuit further comprises a second voltage follower sub-circuit; the third segmented voltage conditioning sub-circuit further comprises a third voltage follower sub-circuit;

the non-inverting input end of the first voltage follower sub-circuit is connected with the output end of the first proportional operational amplifier sub-circuit; the non-inverting input end of the second voltage follower sub-circuit is connected with the output end of the first differential amplifier sub-circuit; the non-inverting input end of the third voltage follower sub-circuit is connected with the output end of the second differential amplifier sub-circuit.

Optionally, the first continuous output regulating circuit includes a fifth resistor and a sixth resistor; the second continuous output regulating circuit comprises a seventh resistor and an eighth resistor;

the first end of the fifth resistor is connected with the direct-current power supply, the second end of the fifth resistor is connected with the first end of the sixth resistor, the second end of the sixth resistor is connected with the ground wire, and the inverting input end of the first differential amplification sub-circuit is connected between the second end of the fifth resistor and the first end of the sixth resistor;

the first end of the seventh resistor is connected with the direct-current power supply, the second end of the seventh resistor is connected with the first end of the eighth resistor, the second end of the eighth resistor is connected with the ground wire, and the inverting input end of the second differential amplification sub-circuit is connected between the second end of the seventh resistor and the first end of the eighth resistor.

In a second aspect, the present application provides a signal measurement device comprising a segmented optional signal conditioning circuit as claimed in any preceding claim.

One of the above technical solutions has the following advantages and beneficial effects:

in the above-mentioned segment-type optional signal conditioning circuit, the circuit includes a segment voltage threshold circuit, a segment voltage conditioning circuit, and a selection circuit, where the segment voltage threshold circuit includes at least two voltage threshold sub-circuits; each voltage threshold sub-circuit is configured to output a corresponding voltage threshold signal, and each voltage threshold signal is preset with a threshold value with different sizes; the segmented voltage conditioning circuit comprises a plurality of segmented voltage conditioning subcircuits; each segmented voltage conditioning sub-circuit is configured to condition an input voltage signal according to the corresponding conducting signal to obtain an output voltage signal; the selection circuit is respectively connected with the sectional voltage threshold circuit and the sectional voltage conditioning circuit; the selection circuit is configured to receive the input voltage signal and each voltage threshold signal, compare the voltage value of the input voltage signal with the threshold value of each voltage threshold signal, and output a corresponding conduction signal according to the comparison result, so as to realize multi-section optional voltage signal conditioning. This application is through taking care of the voltage signal and carrying out optimal design, takes care of to the automatic segmentation of voltage, and flexibility adaptation multistage voltage is taken care of, increases the applicable sampling range that the voltage sampling was taken care of, improves sampling precision and commonality to widen the applicable scene that the voltage sampling was taken care of, improve the commonality of circuit and the accuracy that the sampling was taken care of.

Drawings

Fig. 1 is a schematic diagram of a first circuit structure of a segment-type optional signal conditioning circuit according to an embodiment of the present application.

Fig. 2 is a schematic diagram of a second circuit structure of a segment-type optional signal conditioning circuit according to an embodiment of the present application.

Fig. 3 is a schematic diagram of a third circuit structure of a segment-type optional signal conditioning circuit according to an embodiment of the present application.

Fig. 4 is a schematic diagram of a fourth circuit structure of a segment-type optional signal conditioning circuit according to an embodiment of the present application.

Fig. 5 is a schematic diagram of a fifth circuit structure of a segment-type optional signal conditioning circuit according to an embodiment of the present application.

Fig. 6 is a schematic diagram of a sixth circuit structure of a segment-type optional signal conditioning circuit according to an embodiment of the present application.

Fig. 7 is a schematic diagram of a seventh circuit structure of a segment-type optional signal conditioning circuit in the embodiment of the present application.

Reference numerals:

a segmented voltage threshold circuit 100; a first segment voltage threshold sub-circuit 110; a second segment voltage threshold sub-circuit 120; a segmented voltage conditioning circuit 200; a first segment voltage conditioning subcircuit 210; a first proportional operation amplification sub-circuit 212; a first voltage follower sub-circuit 214; a second segment voltage conditioning sub-circuit 220; a second proportional operational amplifier sub-circuit 222; a first differential amplification sub-circuit 224; a first continuous output regulating circuit 226; a second voltage follower sub-circuit 228; a third segment voltage conditioning sub-circuit 230; a third proportional operational amplifier sub-circuit 232; a second differential amplifier sub-circuit 234; a second continuous output adjustment circuit 236; a third voltage follower sub-circuit 238; a selection circuit 300; a first comparator B1; a second comparator B2; a third comparator B3; a fourth comparator B4; a first switching tube Q1; a second switching tube Q2; a third switching tube Q3; a fourth switching tube Q4; a fifth switching tube Q5; a first resistor R1; a second resistor R2; a third resistor R3; a fourth resistor R4; a fifth resistor R5; a sixth resistor R6; a seventh resistor R7; an eighth resistor R8; a ninth resistor R9; a tenth resistor R10; an eleventh resistor R11; a twelfth resistor R12; a thirteenth resistor R13; a fourteenth resistance R14; a fifteenth resistor R15; a sixteenth resistor R16; a seventeenth resistor R17; an eighteenth resistor R18; a nineteenth resistor R19; a twentieth resistor R20; a twenty-first resistor R21; a twenty-second resistor R22.

Detailed Description

In order to make the technical solutions of the present application better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances in order to facilitate the description of the embodiments of the application herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In addition, the term "plurality" shall mean two as well as more than two.

The voltage sampling and conditioning method aims to solve the problems existing in the existing voltage sampling and conditioning mode. In one embodiment, as shown in fig. 1, an optional signal conditioning circuit is provided that includes a segmented voltage threshold circuit 100, a segmented voltage conditioning circuit 200, and a selection circuit 300.

The segmented voltage threshold circuit 100 includes at least two voltage threshold subcircuits; each voltage threshold sub-circuit is configured to output a corresponding voltage threshold signal, and each voltage threshold signal is preset with a threshold value with different sizes; segmented voltage conditioning circuit 200 includes a plurality of segmented voltage conditioning subcircuits; each segmented voltage conditioning sub-circuit is configured to condition an input voltage signal according to a corresponding conducting signal to obtain an output voltage signal; the selection circuit 300 is respectively connected with the segmented voltage threshold circuit 100 and the segmented voltage conditioning circuit 200; the selection circuit 300 is configured to receive the input voltage signal and each voltage threshold signal, compare the voltage value of the input voltage signal with the threshold value of each voltage threshold signal, and output a corresponding turn-on signal according to the comparison result.

The segmented voltage threshold circuit 100 may include at least 2 corresponding voltage threshold sub-circuits. Each voltage threshold sub-circuit is respectively connected with the selection circuit, and can be configured with a corresponding resistance value, so that each voltage threshold sub-circuit can output a voltage threshold signal with a corresponding threshold value to the selection circuit; the voltage threshold signals output by the voltage threshold sub-circuits are preset with threshold values with different sizes, and the threshold values of the voltage threshold signals refer to corresponding voltage threshold values.

Segmented voltage conditioning circuit 200 may include at least 3 respective segmented voltage conditioning subcircuits. Each segmented voltage conditioning subcircuit is connected with the selection circuit respectively, and the segmented voltage conditioning subcircuit can receive the conduction signals transmitted by the selection circuit and further condition the input voltage signals according to the corresponding conduction signals, so that output voltage signals are obtained.

The selection circuit 300 may be provided with an input interface for receiving an input voltage signal. The selection circuit 300 is connected to each voltage threshold sub-circuit, and the selection circuit 300 receives the input voltage signal and each voltage threshold signal, compares the input voltage signal with each voltage threshold signal, and outputs a corresponding conducting signal according to the comparison result. Based on the signal conditioning channel of the set segmented voltage range, the multi-segment optional voltage signal conditioning of the input voltage signal is realized.

In the above embodiment, by setting the segmented voltage threshold circuit 100, the segmented voltage conditioning circuit 200, and the selection circuit 300, the voltage signal conditioning is optimally designed, the voltage is automatically conditioned in segments, the flexibility is adapted to the multi-segment voltage conditioning, the applicable sampling range of the voltage sampling conditioning is increased, and the sampling precision and the universality are improved. Therefore, the applicable scene of voltage sampling conditioning is widened, and the universality of the circuit and the accuracy of sampling conditioning are improved.

In one embodiment, as shown in fig. 2, an optional signal conditioning circuit is provided that includes a segmented voltage threshold circuit 100, a segmented voltage conditioning circuit 200, and a selection circuit 300. The segmented voltage threshold circuit 100 comprises at least a first segmented voltage threshold sub-circuit 110 and a second segmented voltage threshold sub-circuit 120; the segmented voltage conditioning circuit 200 includes at least a first segmented voltage conditioning subcircuit 210, a second segmented voltage conditioning subcircuit 220, and a third segmented voltage conditioning subcircuit 230.

The first segment voltage threshold sub-circuit 110 is configured to output a first voltage threshold signal; the second segment voltage threshold sub-circuit 120 is configured to output a second voltage threshold signal; the threshold value of the first voltage threshold signal is smaller than the threshold value of the second voltage threshold signal; the first segment voltage conditioning sub-circuit 210 is configured to condition the input voltage signal according to the received first turn-on signal, and output a first output voltage signal; the second segment voltage conditioning sub-circuit 220 is configured to condition the input voltage signal according to the received second conducting signal and output a second output voltage signal; the third segment voltage conditioning sub-circuit 230 is configured to condition the input voltage signal according to the received third turn-on signal, and output a third output voltage signal; the selection circuit 300 is configured to receive an input voltage signal, a first voltage threshold signal, and a second voltage threshold signal; the selection circuit 300 is further configured to output a first conduction signal when the voltage value of the input voltage signal is smaller than the threshold value of the first voltage threshold signal, output a second conduction signal when the voltage value of the input voltage signal is larger than the threshold value of the first voltage threshold signal and smaller than the threshold value of the second voltage threshold signal, and output a third conduction signal when the voltage value of the input voltage signal is larger than the threshold value of the second voltage threshold signal.

The segmented voltage threshold circuit 100 may include at least 2 corresponding sub-circuits. For example, segmented voltage threshold circuit 100 may include a first segmented voltage threshold sub-circuit 110, an nth segmented voltage threshold sub-circuit; n is a positive integer greater than or equal to 2. For example, the present application takes the example of dividing the voltage range into three segments for voltage signal conditioning, that is, the segmented voltage threshold circuit 100 includes the first segmented voltage threshold sub-circuit 110 and the second segmented voltage threshold sub-circuit 120 for description, and for voltage signal conditioning in four segments, the segmented voltage threshold circuit 100 includes 3 corresponding sub-circuits; for voltage signal conditioning in five voltage ranges, the segmented voltage threshold circuit 100 includes 4 corresponding sub-circuits, and so on, and for voltage signal conditioning in more voltage ranges, such as four voltage ranges, five voltage ranges, and so on, reference may be made to the voltage signal conditioning process in three voltage ranges, which is not described herein again.

The first segmented voltage threshold sub-circuit 110 is connected to the selection circuit 300, and the first segmented voltage threshold sub-circuit 110 can output the first voltage threshold signal to the selection circuit 300 by configuring a resistance value to the first segmented voltage threshold sub-circuit 110. The second segment voltage threshold sub-circuit 120 is connected to the selection circuit 300, and the second segment voltage threshold sub-circuit 120 can output a second voltage threshold signal to the selection circuit 300 by configuring a resistance value for the second segment voltage threshold sub-circuit 120. Wherein the threshold value of the first voltage threshold signal is smaller than the threshold value of the second voltage threshold signal; the threshold value of the first voltage threshold signal and the threshold value of the second voltage threshold signal are respectively referred to as corresponding voltage threshold values.

Segmented voltage conditioning circuit 200 may include at least 3 respective sub-circuits. For example, the segmented voltage conditioning circuit 200 may include a first segmented voltage conditioning sub-circuit 210, a second segmented voltage conditioning sub-circuit 220, an mth segmented voltage conditioning sub-circuit; n is a positive integer greater than or equal to 3. For example, the voltage signal conditioning is described by taking a voltage range divided into three sections as an example, that is, the segmented voltage conditioning circuit 200 includes a first segmented voltage conditioning sub-circuit 210, a second segmented voltage conditioning sub-circuit 220, and a third segmented voltage conditioning sub-circuit 230 as an example, and for voltage signal conditioning in a four-section voltage range, the segmented voltage conditioning circuit 200 includes 4 corresponding sub-circuits; for voltage signal conditioning in five voltage ranges, the segmented voltage conditioning circuit 200 includes 5 corresponding sub-circuits, and so on, and for voltage signal conditioning in more voltage ranges, such as four voltage ranges, five voltage ranges, and so on, reference may be made to the voltage signal conditioning process in three voltage ranges, which is not described herein again.

The selection circuit 300 may be provided with an input interface for receiving an input voltage signal. The selection circuit 300 is connected to the first segment voltage threshold sub-circuit 110 and the second segment voltage threshold sub-circuit 120, and the selection circuit 300 receives the input voltage signal, the first voltage threshold signal and the second voltage threshold signal, compares the input voltage signal with the first voltage threshold signal and the second voltage threshold signal, and outputs a first conduction signal to the first segment voltage conditioning sub-circuit 210 according to a comparison result when the voltage value of the input voltage signal is smaller than the threshold value of the first voltage threshold signal, so that the first segment voltage conditioning sub-circuit 210 conditions the input voltage signal according to the received first conduction signal and outputs a first output voltage signal. When the voltage value of the input voltage signal is greater than the threshold value of the first voltage threshold signal and less than the threshold value of the second voltage threshold signal, the selection circuit 300 outputs the second conduction signal, so that the second segment voltage conditioning sub-circuit 220 conditions the input voltage signal according to the received second conduction signal and outputs the second output voltage signal. When the voltage value of the input voltage signal is greater than the threshold value of the second voltage threshold signal, the selection circuit 300 outputs a third conduction signal, so that the third segmented voltage conditioning sub-circuit 230 conditions the input voltage signal according to the received third conduction signal, outputs a third output voltage signal, and implements multi-segment optional voltage signal conditioning on the input voltage signal based on a signal conditioning channel of a set segmented voltage range.

In the above embodiment, by setting the segmented voltage threshold circuit 100, the segmented voltage conditioning circuit 200, and the selection circuit 300, the voltage signal conditioning is optimally designed, the voltage is automatically and segmentally conditioned, the flexibility is adapted to the multisection voltage conditioning, the applicable sampling range of the voltage sampling conditioning is increased, and the sampling precision and the universality are improved. Therefore, the applicable scene of voltage sampling conditioning is widened, and the universality of the circuit and the accuracy of sampling conditioning are improved.

In one example, as shown in fig. 3, the selection circuit 300 includes a first comparator B1, a second comparator B2, a third comparator B3, a fourth comparator B4, a first switch tube Q1 and a second switch tube Q2.

A first input terminal of the first comparator B1 is configured to receive an input voltage signal, a second input terminal of the first comparator B1 is connected to the output terminal of the first segment voltage threshold sub-circuit 110, and an output terminal of the first comparator B1 is connected to the first segment voltage conditioning sub-circuit 210; the power supply terminal of the first segment voltage threshold sub-circuit 110 is connected to a dc power supply VCC. A first input terminal of the second comparator B2 is connected to the output terminal of the first segment voltage threshold sub-circuit 110, a second input terminal of the second comparator B2 is configured to receive an input voltage signal, and an output terminal of the second comparator B2 is connected to the gate of the first switch Q1 and the gate of the second switch Q2 respectively. A first input terminal of the third comparator B3 is connected to the output terminal of the second segment voltage threshold sub-circuit 120, a second input terminal of the third comparator B3 is connected to the source of the first switch Q1, and an output terminal of the third comparator B3 is connected to the third segment voltage conditioning sub-circuit 230. A first input terminal of the fourth comparator B4 is connected to the source of the first switch Q1, a second input terminal of the fourth comparator B4 is connected to the output terminal of the second segment voltage threshold sub-circuit 120, and an output terminal of the fourth comparator B4 is connected to the second segment voltage conditioning sub-circuit 220. The drain electrode of the first switching tube Q1 is used for accessing an input voltage signal; the drain of the second switching transistor Q2 is connected to the dc power supply VCC, and the source of the second switching transistor Q2 is connected to the power supply terminal of the second segment voltage threshold sub-circuit 120.

The first comparator B1, the second comparator B2, the third comparator B3, and the fourth comparator B4 may all adopt operational comparators. The first switching tube Q1 and the second switching tube Q2 may be MOS tubes, for example, the first switching tube Q1 and the second switching tube Q2 may be N-type MOS tubes.

For example, the first comparator B1, the second comparator B2, the third comparator B3, and the fourth comparator B4 are arithmetic comparators. The first switching tube Q1 and the second switching tube Q2 are N-type MOS tubes for example. The first input of the first comparator B1 is referred to as the inverting input of the first comparator B1, and the second input of the first comparator B1 is referred to as the non-inverting input of the first comparator B1. The first input of the second comparator B2 refers to the inverting input of the second comparator B2 and the second input of the second comparator B2 refers to the non-inverting input of the second comparator B2. The first input of the third comparator B3 refers to the inverting input of the third comparator B3 and the second input of the third comparator B3 refers to the non-inverting input of the third comparator B3. The first input of the fourth comparator B4 refers to the inverting input of the fourth comparator B4 and the second input of the fourth comparator B4 refers to the non-inverting input of the fourth comparator B4.

Based on the power end of the first segment voltage threshold sub-circuit 110 being connected to the dc power VCC, the first segment voltage threshold sub-circuit 110 can divide the voltage of the dc power VCC to output a first voltage threshold signal. Based on that the first input end of the first comparator B1 receives the input voltage signal, the second input end of the first comparator B1 receives the first voltage threshold signal, the first comparator B1 performs voltage amplitude comparison on the input voltage signal and the first voltage threshold signal, and when the voltage amplitude of the input voltage signal is greater than that of the first voltage threshold signal, the first segment voltage conditioning sub-circuit 210 keeps the off state; when the voltage amplitude of the input voltage signal is smaller than the voltage amplitude of the first voltage threshold signal, the first conduction signal is transmitted to the first segment voltage conditioning sub-circuit 210, and then the first segment voltage conditioning sub-circuit 210 conditions the input voltage signal according to the received first conduction signal, and outputs a first output voltage signal. Illustratively, the first turn-on signal may be a high level signal. For example, when the voltage amplitude of the input voltage signal is greater than the voltage amplitude of the first voltage threshold signal, the first comparator B1 transmits a low level signal to the first segment voltage conditioning sub-circuit 210, and the first segment voltage conditioning sub-circuit 210 keeps an off state; when the voltage amplitude of the input voltage signal is smaller than the voltage amplitude of the first voltage threshold signal, a high level signal is transmitted to the first segment voltage conditioning sub-circuit 210, and the first segment voltage conditioning sub-circuit 210 is turned on to operate.

Based on that the first input end of the second comparator B2 receives the first voltage threshold signal, the second input end of the second comparator B2 receives the input voltage signal, the second comparator B2 performs voltage amplitude comparison on the input voltage signal and the first voltage threshold signal, and when the voltage amplitude of the input voltage signal is smaller than that of the first voltage threshold signal, the first switch tube Q1 and the second switch tube Q2 are both turned off, so that the second segmented voltage conditioning sub-circuit 220 and the third segmented voltage conditioning sub-circuit 230 keep the off state. When the voltage amplitude of the input voltage signal is greater than the voltage amplitude of the first voltage threshold signal, the second comparator B2 controls the first switching tube Q1 and the second switching tube Q2 to be conducted. For example, when the voltage amplitude of the input voltage signal is smaller than the voltage amplitude of the first voltage threshold signal, the second comparator B2 transmits a low-level signal to the gates of the first switching tube Q1 and the second switching tube Q2, so that the first switching tube Q1 and the second switching tube Q2 keep an off state; when the voltage amplitude of the input voltage signal is greater than that of the first voltage threshold signal, a high level signal is transmitted to the gates of the first switch tube Q1 and the second switch tube Q2, and then the first switch tube Q1 and the second switch tube Q2 are both switched on to work.

Based on that the drain of the second switching tube Q2 is connected to the dc power VCC, the source of the second switching tube Q2 is connected to the power end of the second segment voltage threshold sub-circuit 120, when the second switching tube Q2 is turned on, the second segment voltage threshold sub-circuit 120 is turned on, and the second segment voltage threshold sub-circuit 120 transmits the second voltage threshold signal to the first input terminal of the third comparator B3 and the second input terminal of the fourth comparator B4, respectively. Based on that the drain of the first switching tube Q1 is used to access an input voltage signal, when the second switching tube Q2 is turned on, the first switching tube Q1 is also in a turned-on state, the first input end of the third comparator B3 receives a second voltage threshold signal, the second input end of the third comparator B3 receives the input voltage signal, the third comparator B3 performs a voltage amplitude comparison between the input voltage signal and the second voltage threshold signal, and when the voltage amplitude of the input voltage signal is smaller than that of the second voltage threshold signal, the third segmented voltage conditioning sub-circuit 230 maintains the turned-off state; when the voltage amplitude of the input voltage signal is greater than the voltage amplitude of the second voltage threshold signal, a third conduction signal is transmitted to the third segment voltage conditioning sub-circuit 230, and then the third segment voltage conditioning sub-circuit 230 conditions the input voltage signal according to the received third conduction signal and outputs a third output voltage signal.

Based on that the drain of the first switching tube Q1 is used for accessing an input voltage signal, when the second switching tube Q2 is turned on, the first switching tube Q1 is also in a turned-on state, the second input end of the fourth comparator B4 receives a second voltage threshold signal, the first input end of the fourth comparator B4 receives the input voltage signal, the fourth comparator B4 performs voltage amplitude comparison on the input voltage signal and the second voltage threshold signal, and when the voltage amplitude of the input voltage signal is greater than that of the second voltage threshold signal, the second segmented voltage conditioning sub-circuit 220 maintains the turned-off state; when the voltage amplitude of the input voltage signal is smaller than the voltage amplitude of the second voltage threshold signal, the second conduction signal is transmitted to the second segment voltage conditioning sub-circuit 220, and then the second segment voltage conditioning sub-circuit 220 conditions the input voltage signal according to the received second conduction signal and outputs a second output voltage signal.

In the above embodiment, by setting the segment voltage threshold circuit 100, the segment voltage conditioning circuit 200, and the selection circuit 300, the selection circuit 300 includes the first comparator B1, the second comparator B2, the third comparator B3, the fourth comparator B4, the first switch tube Q1, and the second switch tube Q2, and compares the input voltage signals by dividing a plurality of input voltage ranges, and when the voltage amplitude of the input voltage signal falls into the corresponding input voltage range, the corresponding voltage conditioning sub-circuits (the first voltage conditioning sub-circuit, the second voltage conditioning sub-circuit, and the third voltage conditioning sub-circuit) are turned on, so as to implement the multi-segment selectable voltage signal conditioning. This application is through taking care of the voltage signal and carrying out optimal design, to the automatic segmentation of voltage is taken care of, and flexibility adaptation multistage voltage is taken care of, increases the applicable sampling range that the voltage sampling was taken care of, improves sampling precision and commonality. Therefore, the applicable scene of voltage sampling conditioning is widened, and the universality of the circuit and the accuracy of sampling conditioning are improved.

In one example, as shown in fig. 4, the first segment voltage threshold sub-circuit 110 includes a first resistor R1 and a second resistor R2. The first end of the first resistor R1 is connected with a direct current power supply VCC, the second end of the first resistor R1 is connected with the first end of the second resistor R2, the second end of the second resistor R2 is connected with a ground wire, and the second input end of the first comparator B1 and the first input end of the second comparator B2 are respectively connected between the second end of the first resistor R1 and the first end of the second resistor R2.

Based on the connection relationship between the first resistor R1 and the second resistor R2, assuming that the resistance of the first resistor R1 is R1, the resistance of the second resistor R2 is R2, and the voltage value of the dc power supply VCC is VCC, the voltage threshold value of the first voltage threshold signal of the first segment voltage threshold sub-circuit 110 is:

illustratively, the first resistor R1 and the second resistor R2 may be adjustable resistors.

In one example, as shown in fig. 4, the second segment voltage threshold sub-circuit 120 includes a third resistor R3 and a fourth resistor R4. The first end of the third resistor R3 is connected with the source electrode of the second switch tube Q2, the second end of the third resistor R3 is connected with the first end of the fourth resistor R4, the second end of the fourth resistor R4 is connected with the ground wire, and the first input end of the third comparator B3 and the second input end of the fourth comparator B4 are respectively connected between the second end of the third resistor R3 and the first end of the fourth resistor R4.

Based on the above connection relationship between the third resistor R3 and the fourth resistor R4, assuming that the resistance of the third resistor R3 is R3, the resistance of the fourth resistor R4 is R4, and the voltage value of the dc power supply VCC is VCC, the voltage threshold value of the second voltage threshold signal of the second segment voltage threshold sub-circuit 120 is:

illustratively, the third resistor R3 and the fourth resistor R4 may be adjustable resistors.

Based on the voltage threshold settings for the first segmented voltage threshold sub-circuit 110 and the second segmented voltage threshold sub-circuit 120, the detection range of the input Voltage (VIN) can be further divided into the following three segments: the first section is VIN < VTH1; the second stage is that VTH1 is more than VIN and less than VTH2; the third section is VIN > VTH2.

In one example, as shown in fig. 5, the first segment voltage conditioning sub-circuit 210 includes a third switching tube Q3 and a first proportional operational amplification sub-circuit 212. The grid electrode of the third switching tube Q3 is connected with the output end of the first comparator B1, and the drain electrode of the third switching tube Q3 is used for accessing an input voltage signal; the source of the third switch Q3 is connected to the non-inverting input terminal of the first proportional operational amplifier sub-circuit 212, and the output terminal of the first proportional operational amplifier sub-circuit 212 is configured to output the first proportional amplified voltage signal.

The first scaling sub-circuit 212 is configured to perform a first predetermined scaling process on the input voltage signal.

When the voltage amplitude VIN of the input voltage signal is smaller than the voltage threshold VTH1 of the first voltage threshold signal, the first comparator B1 outputs a high level signal (i.e., a first conduction signal), and the gate of the third transistor Q3 receives the first conduction signal, so that the third transistor Q3 is turned on; the drain electrode based on the third switching tube Q3 is used for accessing an input voltage signal; the source of the third switch Q3 is connected to the non-inverting input terminal of the first scaling sub-circuit 212, and the non-inverting input terminal of the first scaling sub-circuit 212 receives the input voltage signal, and outputs the first scaling voltage signal through the first predetermined scaling process of the first scaling sub-circuit 212.

In one example, as shown in fig. 5, the second segmented voltage conditioning sub-circuit 220 includes a fourth switching tube Q4, a second proportional operational amplification sub-circuit 222, a first differential amplification sub-circuit 224, and a first continuous output regulation circuit 226. The grid electrode of the fourth switching tube Q4 is connected with the output end of the fourth comparator B4, and the drain electrode of the fourth switching tube Q4 is used for accessing an input voltage signal; the source of the fourth switch Q4 is connected to the non-inverting input terminal of the second proportional operational amplifier sub-circuit 222, the output terminal of the second proportional operational amplifier sub-circuit 222 is configured to transmit the second proportional amplified voltage signal to the non-inverting input terminal of the first differential amplifier sub-circuit 224, and the inverting input terminal of the first differential amplifier sub-circuit 224 is connected to the first continuous output adjusting circuit 226; the output of the first differential amplification sub-circuit 224 is configured to output a regulated second scaled amplified voltage signal.

The second proportional operational amplifier sub-circuit 222 is configured to amplify the input voltage signal by a second predetermined ratio. The first differential amplifier sub-circuit 224 has the characteristic of circuit symmetry, and can play a role in stabilizing the operating point. The first continuous output regulating circuit 226 is used to regulate the output voltage such that the output voltage has continuity. For example, the first continuous output adjustment circuit 226 is used to output a first continuous output adjustment signal.

When the voltage amplitude VIN of the input voltage signal is greater than the voltage threshold VTH1 of the first voltage threshold signal and smaller than the voltage threshold VTH2 of the second voltage threshold signal, the fourth comparator B4 outputs a high level signal (i.e., a second conduction signal), and the gate of the fourth switching tube Q4 receives the second conduction signal, so that the fourth switching tube Q4 is turned on; the drain electrode based on the fourth switching tube Q4 is used for accessing an input voltage signal; the source of the fourth switching tube Q4 is connected to the non-inverting input terminal of the second proportional operational amplifier sub-circuit 222, and the non-inverting input terminal of the second proportional operational amplifier sub-circuit 222 receives the input voltage signal, and transmits the second proportional amplified voltage signal to the non-inverting input terminal of the first differential amplifier sub-circuit 224 through the second predetermined proportional amplification processing of the second proportional operational amplifier sub-circuit 222. Based on that the inverting input terminal of the first differential amplification sub-circuit 224 is connected to the first continuous output adjusting circuit 226, the inverting input terminal of the first differential amplification sub-circuit 224 is connected to the first continuous output adjusting signal, and through the differential amplification process of the first differential amplification sub-circuit 224, the output terminal of the first differential amplification sub-circuit 224 outputs the adjusted second proportional amplification voltage signal.

In one example, as shown in fig. 5, the third segmented voltage conditioning sub-circuit 230 includes a fifth switching tube Q5, a third proportional operational amplifier sub-circuit 232, a second differential amplifier sub-circuit 234, and a second continuous output regulating circuit 236. The grid electrode of the fifth switching tube Q5 is connected with the output end of the third comparator B3, and the drain electrode of the fifth switching tube Q5 is used for accessing an input voltage signal; the source of the fifth switching tube Q5 is connected to the non-inverting input terminal of the third proportional operational amplifier sub-circuit 232, the output terminal of the third proportional operational amplifier sub-circuit 232 is configured to transmit a third proportional amplified voltage signal to the non-inverting input terminal of the second differential amplifier sub-circuit 234, and the inverting input terminal of the second differential amplifier sub-circuit 234 is connected to the second continuous output adjustment circuit 236; the output of the second differential amplification sub-circuit 234 is configured to output a regulated third scaled amplified voltage signal.

The third proportional operational amplifier sub-circuit 232 is configured to amplify the input voltage signal by a third predetermined ratio. The second differential amplifier sub-circuit 234 has the characteristic of circuit symmetry, and can play a role in stabilizing the operating point. The second continuous output adjustment circuit 236 is used to adjust the output voltage such that the output voltage has continuity. For example, the second continuous output adjust circuit 236 is operable to output a second continuous output adjust signal.

When the voltage amplitude VIN of the input voltage signal is greater than the voltage threshold VTH2 of the second voltage threshold signal, the third comparator B3 outputs a high level signal (i.e., a third conduction signal), and the gate of the fifth switching tube Q5 receives the third conduction signal, so that the fifth switching tube Q5 is turned on; the drain electrode of the fifth switching tube Q5 is used for accessing an input voltage signal; the source of the fifth switching tube Q5 is connected to the non-inverting input terminal of the third scaling sub-circuit 232, and the non-inverting input terminal of the third scaling sub-circuit 232 receives the input voltage signal, and transmits the third scaling voltage signal to the non-inverting input terminal of the second differential amplifier sub-circuit 234 through the third predetermined scaling process of the third scaling sub-circuit 232. Based on that the inverting input terminal of the second differential amplification sub-circuit 234 is connected to the second continuous output adjustment circuit 236, the inverting input terminal of the second differential amplification sub-circuit 234 is connected to the second continuous output adjustment signal, and through the differential amplification processing of the second differential amplification sub-circuit 234, the output terminal of the second differential amplification sub-circuit 234 outputs the adjusted third proportional amplification voltage signal.

By optimally designing voltage signal conditioning, the voltage is automatically conditioned in a segmented manner, the flexibility is adaptive to the multi-segment voltage conditioning, the applicable sampling range of the voltage sampling conditioning is enlarged, and the sampling precision and the universality are improved. By arranging the first continuous output regulating circuit 226 and the second continuous output regulating circuit 236, the voltage output continuity is realized, the applicable scene of voltage sampling conditioning is widened, and the universality of the circuit and the accuracy of sampling conditioning are improved.

In one example, as shown in fig. 6, the first segment voltage conditioning subcircuit 210 further includes a first voltage follower subcircuit 214; the second segmented voltage conditioning sub-circuit 220 further comprises a second voltage follower sub-circuit 228; the third segment voltage conditioning sub-circuit 230 also includes a third voltage follower sub-circuit 238. The non-inverting input terminal of the first voltage follower sub-circuit 214 is connected to the output terminal of the first scaling amplifier sub-circuit 212; the non-inverting input terminal of the second voltage follower sub-circuit 228 is connected to the output terminal of the first differential amplifier sub-circuit 224; the non-inverting input of the third voltage follower sub-circuit 238 is connected to the output of the second differential amplifier sub-circuit 234.

Based on the non-inverting input terminal of the first voltage follower sub-circuit 214 being connected to the output terminal of the first scaling sub-circuit 212, the first voltage follower sub-circuit 214 plays a role in buffering and isolation, so that the first scaling sub-circuit 212 and the back-end circuit are not affected by each other, and the reliability of voltage signal conditioning is improved. Based on the non-inverting input terminal of the second voltage follower sub-circuit 228 connected to the output terminal of the first differential amplifier sub-circuit 224, the second voltage follower sub-circuit 228 plays a role in buffering and isolation, so that the first differential amplifier sub-circuit 224 and the back-end circuit are not affected by each other, and the reliability of voltage signal conditioning is improved. Based on the non-inverting input terminal of the third voltage follower sub-circuit 238 being connected to the output terminal of the second differential amplifier sub-circuit 234, the third voltage follower sub-circuit 238 plays a role in buffering and isolating, so that the second differential amplifier sub-circuit 234 and the back-end circuit are not affected by each other, and the reliability of voltage signal conditioning is improved.

In one example, as shown in fig. 7, the first continuous output adjustment circuit 226 includes a fifth resistor R5 and a sixth resistor R6; the second continuous output adjustment circuit 236 includes a seventh resistor R7 and an eighth resistor R8.

A first end of the fifth resistor R5 is connected to the dc power supply VCC, a second end of the fifth resistor R5 is connected to a first end of the sixth resistor R6, a second end of the sixth resistor R6 is connected to the ground, and an inverting input terminal of the first differential amplifier sub-circuit 224 is connected between the second end of the fifth resistor R5 and the first end of the sixth resistor R6. A first end of the seventh resistor R7 is connected to the dc power supply VCC, a second end of the seventh resistor R7 is connected to a first end of the eighth resistor R8, a second end of the eighth resistor R8 is connected to the ground, and an inverting input terminal of the second differential amplifier sub-circuit 234 is connected between the second end of the seventh resistor R7 and the first end of the eighth resistor R8.

Based on the above connection relationship between the fifth resistor R5 and the sixth resistor R6, if the resistance of the fifth resistor R5 is R5, the resistance of the sixth resistor R6 is R6, and the voltage value of the dc power supply VCC is VCC, the voltage regulation value of the first continuous output regulation signal of the first continuous output regulation circuit 226 is:

based on the above connection relationship between the seventh resistor R7 and the eighth resistor R8, if the resistance of the seventh resistor R7 is R7, the resistance of the eighth resistor R8 is R8, and the voltage value of the dc power supply VCC is VCC, the voltage regulation value of the second continuous output regulation signal of the second continuous output regulation circuit 236 is:

for example, the fifth resistor R5 and the sixth resistor R6 may be adjustable resistors; the seventh resistor R7 and the eighth resistor R8 may be adjustable resistors.

In one example, as shown in fig. 7, the first segment voltage threshold sub-circuit 110 includes a first resistor R1 and a second resistor R2; the second segment voltage threshold sub-circuit 120 includes a third resistor R3 and a fourth resistor R4. The resistance value of the first resistor R1 is R1, the resistance value of the second resistor R2 is R2, the resistance value of the third resistor R3 is R3, the resistance value of the fourth resistor R4 is R4, the resistance value of the fifth resistor R5 is R5, the resistance value of the sixth resistor R6 is R6, the resistance value of the seventh resistor R7 is R7, the resistance value of the eighth resistor R8 is R8, and the voltage of the direct-current power supply VCC is VCC.

Through setting up the resistance R1 of first resistance R1, the resistance R2 of second resistance R2, the resistance R3 of third resistance R3, the resistance R4 of fourth resistance R4, and then set up the voltage threshold value VTH1 of first voltage threshold signal and the voltage threshold value VTH2 of second voltage threshold signal:

the input voltage VIN is compared with a voltage threshold VTH1 of the first voltage threshold signal and a voltage threshold VTH2 of the second voltage threshold signal through the selection circuit 300, when VIN is smaller than VTH1, the third switching tube Q3 of the first sectional voltage conditioning sub-circuit 210 is closed, the first switching tube Q1 and the second switching tube Q2 are both opened, the first sectional voltage conditioning sub-circuit 210 is turned on and works, and the second sectional voltage conditioning sub-circuit 220 and the third sectional voltage conditioning sub-circuit 230 are turned off and do not work; when VTH1 is more than VIN and less than VTH2, the first switch tube Q1, the second switch tube Q2 and the fourth switch tube Q4 are all closed, the third switch tube Q3 and the fifth switch tube Q5 are all opened, then the second sectional voltage conditioning sub-circuit 220 is conducted and works, and the first sectional voltage conditioning sub-circuit 210 and the third sectional voltage conditioning sub-circuit 230 are opened and do not work; when VTH2 is less than VIN, the first switch tube Q1, the second switch tube Q2 and the fifth switch tube Q5 are all closed, the third switch tube Q3 and the fourth switch tube Q4 are all opened, the third segment voltage conditioning sub-circuit 230 is turned on to operate, and the first segment voltage conditioning sub-circuit 210 and the second segment voltage conditioning sub-circuit 220 are turned off to operate.

Specifically, as shown in fig. 7, the first proportional operational amplifier sub-circuit 212 includes a first operational amplifier, a ninth resistor R9 (with a resistance value R9), and a tenth resistor R10 (with a resistance value R10); the second proportional operational amplifier sub-circuit 222 includes a second operational amplifier, an eleventh resistor R11 (with a resistance value R11), and a twelfth resistor R12 (with a resistance value R12); the third proportional operational amplifier sub-circuit 232 includes a third operational amplifier, a thirteenth resistor R13 (with a resistance value R13), and a fourteenth resistor R14 (with a resistance value R14). The first differential amplifier sub-circuit 224 includes a fourth operational amplifier, a fifteenth resistor R15 (with a resistance value R15), a sixteenth resistor R16 (with a resistance value R16), a seventeenth resistor R17 (with a resistance value R17), and an eighteenth resistor R18 (with a resistance value R18). The second differential amplifier sub-circuit 234 includes a fifth operational amplifier, a nineteenth resistor R19 (having a resistance value R19), a twentieth resistor R20 (having a resistance value R20), a twenty-first resistor R21 (having a resistance value R21), and a twenty-second resistor R22 (having a resistance value R22).

When VIN is less than VTH1, the third switching tube Q3 of the first segment voltage conditioning sub-circuit 210 is closed, the first switching tube Q1 and the second switching tube Q2 are both opened, the first segment voltage conditioning sub-circuit 210 is turned on and works, and the second segment voltage conditioning sub-circuit 220 and the third segment voltage conditioning sub-circuit 230 are turned offNot working, and then the output voltage is:

it should be noted that the output voltage can be biased and scaled up as required.

When VTH1 < VIN < VTH2, the first switch tube Q1, the second switch tube Q2 and the fourth switch tube Q4 are all closed, the third switch tube Q3 and the fifth switch tube Q5 are all opened, then the second segment voltage conditioning sub-circuit 220 is conducted and operated, and the first segment voltage conditioning sub-circuit 210 and the third segment voltage conditioning sub-circuit 230 are opened and do not work. Define r15= r16= r17= r18, when the output voltage is:

to achieve voltage output continuity, the VTH3 voltage is set to:

and then the output voltage is:

when VTH2 is less than VIN, the first switching tube Q1, the second switching tube Q2 and the fifth switching tube Q5 are all closed, the third switching tube Q3 and the fourth switching tube Q4 are all opened, the third segmented voltage conditioning sub-circuit 230 is turned on and works, the first segmented voltage conditioning sub-circuit 210 and the second segmented voltage conditioning sub-circuit 220 are turned off and do not work, and r19= r20= r21= r22 is defined, at this time

To achieve output continuity, VT is adjustedThe H4 voltage is set to:

and then the output voltage is:

that is, the input voltage VIN is conditioned, and the output result is:

it should be noted that, through similar ideas, multi-segment voltage continuous signal conditioning of four segments, five segments, six segments, and the like can be realized.

In the above embodiment, the multiple input voltage ranges are divided, the input voltage signals are compared, and when the voltage amplitude of the input voltage signal falls into the corresponding input voltage range, the corresponding voltage conditioning sub-circuits (the first voltage conditioning sub-circuit, the second voltage conditioning sub-circuit, and the third voltage conditioning sub-circuit) are turned on, so that the multi-stage optional voltage signal conditioning is realized. This application is through carrying out optimal design to voltage signal conditioning, and to voltage automatic segmentation conditioning, flexibility adaptation multistage voltage is tempered, increases the applicable sampling range that voltage sampling was tempered, improves sampling precision and commonality. Therefore, the applicable scene of voltage sampling conditioning is widened, and the universality of the circuit and the accuracy of sampling conditioning are improved.

In one embodiment, there is also provided a signal measurement device comprising a segmented optional signal conditioning circuit as claimed in any one of the preceding claims.

For a detailed description of the above-mentioned segment-type optional signal conditioning circuit, reference is made to the description of the above-mentioned embodiments, which are not repeated herein.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A segmented, optionally configurable, signal conditioning circuit, comprising:

a segmented voltage threshold circuit comprising at least two voltage threshold sub-circuits; each voltage threshold sub-circuit is configured to output a corresponding voltage threshold signal, and each voltage threshold signal is preset with threshold values with different sizes;

a segmented voltage conditioning circuit comprising a plurality of segmented voltage conditioning subcircuits; each segmented voltage conditioning sub-circuit is configured to condition an input voltage signal according to a corresponding conduction signal to obtain an output voltage signal;

the selection circuit is respectively connected with the segmented voltage threshold circuit and the segmented voltage conditioning circuit; the selection circuit is configured to receive the input voltage signal and each of the voltage threshold signals, compare a voltage value of the input voltage signal with a threshold value of each of the voltage threshold signals, and output a corresponding turn-on signal according to a comparison result.

2. The segmented optional signal conditioning circuit of claim 1,

the segmented voltage threshold circuit at least comprises a first segmented voltage threshold sub-circuit and a second segmented voltage threshold sub-circuit; the first segment voltage threshold sub-circuit is configured to output a first voltage threshold signal; the second segment voltage threshold sub-circuit is configured to output a second voltage threshold signal; the threshold value of the first voltage threshold signal is smaller than the threshold value of the second voltage threshold signal;

the segmented voltage conditioning circuit at least comprises a first segmented voltage conditioning sub-circuit, a second segmented voltage conditioning sub-circuit and a third segmented voltage conditioning sub-circuit; the first segmented voltage conditioning sub-circuit is configured to condition the input voltage signal according to a received first conduction signal and output a first output voltage signal; the second segmented voltage conditioning sub-circuit is configured to condition the input voltage signal according to a received second conduction signal and output a second output voltage signal; the third segment voltage conditioning sub-circuit is configured to condition the input voltage signal according to the received third conducting signal and output a third output voltage signal;

the selection circuit is configured to receive an input voltage signal, the first voltage threshold signal, and the second voltage threshold signal; the selection circuit is further configured to output the first conduction signal when the voltage value of the input voltage signal is smaller than the threshold value of the first voltage threshold signal, output the second conduction signal when the voltage value of the input voltage signal is larger than the threshold value of the first voltage threshold signal and smaller than the threshold value of the second voltage threshold signal, and output the third conduction signal when the voltage value of the input voltage signal is larger than the threshold value of the second voltage threshold signal.

3. The segmented optional signal conditioning circuit of claim 2, wherein the selection circuit comprises a first comparator, a second comparator, a third comparator, a fourth comparator, a first switching tube, and a second switching tube;

a first input end of the first comparator is used for receiving the input voltage signal, a second input end of the first comparator is connected with an output end of the first segmented voltage threshold sub-circuit, and an output end of the first comparator is connected with the first segmented voltage conditioning sub-circuit; the power supply end of the first segmented voltage threshold sub-circuit is used for being connected with a direct current power supply;

a first input end of the second comparator is connected with an output end of the first segment voltage threshold sub-circuit, a second input end of the second comparator is used for receiving the input voltage signal, and an output end of the second comparator is connected with a grid electrode of the first switch tube and a grid electrode of the second switch tube respectively;

a first input end of the third comparator is connected with an output end of the second segmented voltage threshold sub-circuit, a second input end of the third comparator is connected with a source electrode of the first switching tube, and an output end of the third comparator is connected with the third segmented voltage conditioning sub-circuit;

the drain electrode of the first switching tube is used for accessing the input voltage signal; the drain electrode of the second switch tube is connected with the direct-current power supply, and the source electrode of the second switch tube is connected with the power supply end of the second segmented voltage threshold sub-circuit.

4. The segmented optional signal conditioning circuit of claim 3, wherein the first segmented voltage threshold sub-circuit comprises a first resistor and a second resistor;

the first end of the first resistor is connected with the direct current power supply, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is connected with the ground wire, and the second input end of the first comparator and the first input end of the second comparator are respectively connected between the second end of the first resistor and the first end of the second resistor.

5. The segmented, optionally configurable signal conditioning circuit of claim 4, wherein said second segmented voltage threshold sub-circuit comprises a third resistor and a fourth resistor;

6. The sectionalized optional signal conditioning circuit of any of claims 3 to 5, wherein the first sectionalized voltage conditioning sub-circuit comprises a third switch tube and a first proportional operational amplifier sub-circuit;

the grid electrode of the third switching tube is connected with the output end of the first comparator, and the drain electrode of the third switching tube is used for accessing the input voltage signal; the source electrode of the third switching tube is connected with the non-inverting input end of the first proportional operational amplification sub-circuit, and the output end of the first proportional operational amplification sub-circuit is configured to output a first proportional amplified voltage signal.

7. The sectionalized optional signal conditioning circuit of claim 6, wherein the second sectionalized voltage conditioning sub-circuit comprises a fourth switching tube, a second proportional operational amplification sub-circuit, a first differential amplification sub-circuit, and a first continuous output regulation circuit;

the grid electrode of the fourth switching tube is connected with the output end of the fourth comparator, and the drain electrode of the fourth switching tube is used for connecting the input voltage signal; a source electrode of the fourth switching tube is connected with a non-inverting input end of the second proportional operational amplification sub-circuit, an output end of the second proportional operational amplification sub-circuit is configured to transmit a second proportional amplification voltage signal to a non-inverting input end of the first differential amplification sub-circuit, and an inverting input end of the first differential amplification sub-circuit is connected with the first continuous output regulating circuit; the output terminal of the first differential amplification sub-circuit is configured to output a regulated second scaled amplified voltage signal.

8. The segmented optional signal conditioning circuit of claim 7, wherein the third segmented voltage conditioning sub-circuit comprises a fifth switching tube, a third proportional operational amplifier sub-circuit, a second differential amplifier sub-circuit, and a second continuous output regulation circuit;

the grid electrode of the fifth switching tube is connected with the output end of the third comparator, and the drain electrode of the fifth switching tube is used for accessing the input voltage signal; a source electrode of the fifth switching tube is connected with a non-inverting input end of the third proportional operational amplifier sub-circuit, an output end of the third proportional operational amplifier sub-circuit is configured to transmit a third proportional amplified voltage signal to a non-inverting input end of the second differential amplifier sub-circuit, and an inverting input end of the second differential amplifier sub-circuit is connected with the second continuous output regulating circuit; the output terminal of the second differential amplification sub-circuit is configured to output the regulated third scaled amplified voltage signal.

9. The segmented optional signal conditioning circuit of claim 8, wherein the first continuous output conditioning circuit comprises a fifth resistor and a sixth resistor; the second continuous output regulating circuit comprises a seventh resistor and an eighth resistor;

the first end of the fifth resistor is connected with the direct-current power supply, the second end of the fifth resistor is connected with the first end of the sixth resistor, the second end of the sixth resistor is connected with the ground wire, and the inverting input end of the first differential amplifier sub-circuit is connected between the second end of the fifth resistor and the first end of the sixth resistor;

the first end of the seventh resistor is connected with the direct-current power supply, the second end of the seventh resistor is connected with the first end of the eighth resistor, the second end of the eighth resistor is connected with the ground wire, and the inverting input end of the second differential amplifier sub-circuit is connected between the second end of the seventh resistor and the first end of the eighth resistor.

10. A signal measurement device comprising an optional signal conditioning circuit of any of claims 1 to 9.